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### 15 Cards in this Set

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 motion The state in which one object's distance from another is changing. reference point A place or object used for comparison to determine if an object is in motion. speed The distance an object travels in one unit of time. velocity Speed in a given direction. acceleration The rate at which velocity changes. force A push or pull exerted on an object. unbalanced forces A net force that causes a change in an object's motion. balanced forces Equal forces acting on an object in opposite directions. Newton's First Law of Motion An object at rest will remain at rest unless an unbalanced force acts upon it. Newton's Second Law of Motion The net force on an object is equal to the mass of the object multiplied by its acceleration. Newton's Third Law of Motion If one object exerts a force on a second object, the object exerts a force of equal strength in the opposite direction on the first object. work The product of force and distance when force is used to move an object. energy The ability to do work or cause change, such as moving one object some distance. potential energy Energy that is stored and available to be used later. kinetic energy Energy that an object has because of its motion.